Australian Energy Market Operator

AEMO operates Australia's National Electricity Market (NEM), the interconnected power system in Australia’s eastern and south-eastern seaboard, and the Wholesale Electricity Market (WEM) and power system in Western Australia.

AEMO operates gas retail markets in New South Wales and the Australian Capital Territory, Queensland, South Australia, Victoria, and Western Australia. AEMO also operates wholesale gas markets in south-eastern Australia, those being the Declared Wholesale Gas Market in Victoria (DWGM), the Short Term Trading Market in Adelaide, Brisbane and Sydney (STTM), and the Gas Supply Hub (GSH), whose trading locations are based at Wallumbilla in Queensland, and Moomba in South Australia. AEMO also operates the Natural Gas Services Bulletin Board (GBB), and is system operator of the Victorian Gas Declared Transmission System. AEMO is also responsible for Gas Services Information functions in Western Australia.

To fund capacity procured through the Reserve Capacity Mechanism, each Market Customer is assigned an Individual Reserve Capacity Requirement (IRCR) obligation based on their contributions to the system peak. The IRCR is calculated monthly, in accordance with Appendix 5 of the Market Rules. An overview of the IRCR is provided in the Reserve Capacity Mechanism section of this website.

Each month AEMO publishes information that can be used by Market Customers to reconcile their IRCR. This information can be found below.

IRCR Hot Season 12 Peak Trading Intervals

Step 1 in Appendix 5 of the Market Rules identifies the 12 Peak Trading Intervals during the Hot Season preceding the initial calculation of IRCR for a Reserve Capacity Cycle. These 12 Peak Trading Intervals then form the basis for calculating IRCR for each Market Customer using interval meter data. The intervals are the start of the interval (for example, Interval 15:00:00 is from 15:00:00 to 15:29:59). For each meter that existed in the relevant Hot Season, a Market Customer can find the contribution towards their IRCR by calculating the median of each meter's readings, corresponding to the 12 peak Trading Intervals, then converting this into a MW value and multiplying this by the relevant ratios as published monthly.

Individual reserve capacity requirement ratios

When determining the IRCR for Trading Month n in accordance with Step 8 of Appendix 5 of the Market Rules, the sum of the Market Customers’ Non-Temperature Dependent Loads (NTDL) and Temperature Dependent Loads (TDL) are adjusted by the NTDL_Ratio and TDL_Ratio respectively. The adjusted values are then summed for each Market Customer and multiplied by the Total_Ratio, in accordance with Step 10 of Appendix 5 of the Market Rules. This ensures the sum of all Market Customer Individual Reserve Capacity Requirements equals the Reserve Capacity Requirement.

This information is published in accordance with Market Rule 10.5.1 (f) ix.

Month/Year

Ratio 1
Step 8 NTDL_Ratio

Ratio 2
Step 8 TDL_Ratio

Ratio 3
Step 10 Total_Ratio

May 2018

1.0972

1.4250

0.9922

Previous IRCR ratio

Month/Year

Ratio 1
Step 8 NTDL_Ratio

Ratio 2
Step 8 TDL_Ratio

Ratio 3
Step 10 Total_Ratio

May 2018

1.0972

1.4250

0.9922

April 2018

1.0972

1.4235

0.9939

March 2018

1.0972

1.4243

0.9930

February 2018

1.0972

1.4237

0.9938

January 2018

1.0972

1.4216

0.9961

December 2017

1.0972

1.4178

0.9962

November 2017

1.0972

1.4163

0.9960

October 2017

1.0972

1.4157

0.9966

September 2017

1.0973

1.2773

0.9913

August 2017

1.0973

1.2769

0.9918

July 2017

1.0973

1.2766

0.9927

June 2017

1.0973

1.2785

0.9897

May 2017

1.0973

1.2764

0.9924

April 2017

1.0973

1.2785

0.9910

March 2017

1.0973

1.2784

00.9909

February 2017

1.0973

1.2740

0.9938

January 2017

1.0973

1.2711

0.9972

December 2016

1.0973

1.2709

0.9967

November 2016

1.0973

1.2708

0.9968

October 2016

1.0973

1.2709

0.9969

September 2016

1.0957

1.5709

0.9893

August 2016

1.0957

1.5675

0.9908

July 2016

1.0957

1.5668

0.9915

June 2016

1.0957

1.5752

0.9875

May 2016

1.0957

1.5741

0.9881

April 2016

1.0957

1.5719

0.9891

March 2016

1.0957

1.5724

0.9888

February 2016

1.0957

1.5675

0.9914

January 2016

1.0957

1.5639

0.9932

December 2015

1.0957

1.5599

0.9954

November 2015

1.0957

1.5583

0.9960

October 2015

1.0956

1.5217

0.9962

September 2015

1.1038

1.6782

0.9710

August 2015

1.1038

1.6756

0.9688

July 2015

1.1038

1.6720

0.9712

June 2015

1.1038

1.6781

0.9721

May 2015

1.1038

1.6758

0.9696

April 2015

1.1038

1.6765

0.9716

March 2015

1.1038

1.6721

0.9719

February 2015

1.1038

1.6663

0.9807

January 2015

1.1038

1.6623

0.9818

December 2014

1.1038

1.6582

0.9803

November 2014

1.1038

1.6522

0.9943

October 2014

1.1038

1.6403

0.9942

September 2014

1.1051

1.6136

0.9879

August 2014

1.1051

1.6135

0.9885

July 2014

1.1051

1.6169

0.9865

June 2014

1.1051

1.6104

0.9893

May 2014

1.1051

1.6083

0.9902

April 2014

1.1051

1.6075

0.9908

March 2014*

1.1051

1.6072

0.9912

February 2014*

1.1051

1.6038

0.9941

January 2014

1.1051

1.5988

0.9944

December 2013

1.1051

1.5954

0.9967

November 2013

1.1044

1.5940

0.9972

October 2013

1.1044

1.5925

0.9974

September 2013

1.1010

1.6499

0.9795

August 2013

1.1010

1.6482

0.9842

July 2013

1.1010

1.6584

0.9764

June 2013

1.1010

1.6577

0.9798

May 2013

1.1010

1.66

0.9803

April 2013

1.1010

1.6595

0.9785

March 2013

1.1010

1.6537

0.9888

February 2013

1.1010

1.6554

0.9896

January 2013

1.1010

1.6509

0.9936

December 2012

1.1010

1.6476

0.9948

November 2012

1.1010

1.6470

0.9954

October 2012

1.1010

1.6488

0.9958

September 2012

1.0963

1.5783

0.9802

August 2012

1.0963

1.5758

0.9807

July 2012

1.0963

1.5782

0.9789

June 2012

1.0963

1.5776

0.9783

May 2012

1.0963

1.5765

0.9795

April 2012

1.0963

1.5753

0.9797

March 2012

1.0963

1.5708

0.9824

February 2012

1.0963

1.5678

0.9829

January 2012

1.0963

1.5646

0.9851

December 2011

1.0963

1.5649

0.9901

November 2011

1.0963

1.5631

0.9866

October 2011

1.0963

1.5781

0.9863

September 2011

1.0911

1.6013

0.9839

August 2011

1.0911

1.5835

0.9861

July 2011

1.0908

1.5895

0.9838

June 2011

1.0908

1.5869

0.9843

May 2011

1.0908

1.5897

0.9816

April 2011

1.0908

1.5874

0.9854

March 2011

1.0908

1.5739

0.9864

February 2011

1.0908

1.5752

0.9864

January 2011

1.0908

1.5649

0.9901

December 2010

1.0908

1.5599

0.9922

November 2010

1.0908

1.5590

0.9927

October 2010

1.0908

1.5584

0.9938

September 2010

1.0854

1.4717

0.9833

August 2010

1.0854

1.4685

0.9852

July 2010

1.0854

1.4799

0.9790

June 2010

1.0854

1.4782

0.9800

May 2010

1.0854

1.4799

0.9790

April 2010

1.0854

1.4759

0.9815

March 2010

1.0854

1.4725

0.9840

February 2010

1.0854

1.4714

0.9850

January 2010

1.0854

1.4597

0.9917

December 2009

1.0854

1.4636

0.9909

November 2009

1.0854

1.4633

0.9911

October 2009

1.0854

1.4623

0.9924

September 2009

1.0868

1.4128

0.9714

August 2009

1.0868

1.4110

0.9773

July 2009

1.0868

1.4173

0.9731

June 2009

1.0868

1.4117

0.9746

May2009

1.0868

1.4084

0.9837

April 2009

1.0868

1.4072

0.9846

March 2009

1.0868

1.4029

0.9882

February 2009

1.0868

1.3996

0.9899

January 2009

1.0868

1.3980

0.9904

December 2008

1.0871

1.4111

0.9942

November 2008

1.0895

1.4138

0.9945

October 2008

1.0895

1.4113

0.9962

September 2008

1.0924

1.5199

0.9630

August 2008

1.0924

1.5165

0.9591

July 2008

1.0924

1.5431

0.9532

June 2008

1.0924

1.5406

0.9478

May 2008

1.0927

1.5617

0.9411

April 2008

1.0927

1.5508

0.9458

March 2008

1.0927

1.5208

0.9625

February 2008

1.0927

1.5454

0.9511

January 2008

1.0927

1.4946

0.9786

December 2007

1.0927

1.4956

0.9691

November 2007

1.0927

1.4931

0.9700

October 2007

1.0927

1.4860

0.9723

September 2007

1.1716

1.4204

0.9550

August 2007

1.1716

1.4180

0.9542

July 2007

1.1716

1.4156

0.9564

June 2007

1.1716

1.4214

0.9533

May 2007

1.1716

1.4133

0.9610

April 2007

1.1714

1.4073

0.9647

March 2007

1.1712

1.4032

0.9678

February 2007

1.1613

1.3867

0.9677

January 2007

1.1169

1.3209

0.9757

December 2006

1.1156

1.3111

0.9800

November 2006

1.1060

1.2914

0.9890

October 2006

1.1056

1.3046

0.9831

September 2006

1.1056

1.2953

0.9884

IRCR monthly 4 Peak Trading Intervals for new meters

When determining the IRCR for Trading Month n, in accordance with Step 5 of Appendix 5 of the Market Rules, the 4 Peak Trading Intervals from Trading Month n-3 are used in the calculation for new meters. A new meter is identified as a meter that was not registered with AEMO during one or more of the Hot Season 12 Peak Trading Intervals. The intervals are the start of the interval (for example, Interval 15:00:00 is from 15:00:00 to 15:29:59). For each new meter, a Market Customer can determine the contribution towards their IRCR by calculating the median of each new meter's readings, corresponding to the 4 peak Trading Intervals, then converting this into a MW value and multiplying this by 1.3 for a TDL or 1.1 for an NTDL, and then multiplying by the Total_Ratio.

Provision of information for the purposes of IRCR

To help AEMO determine individual reserve capacity requirements in accordance with clause 4.28.7 and update individual reserve capacity requirements in accordance with clause 4.28.11, market customers must, by the date and time specified in clause 4.1.23 or no later than by 5.00 pm on the business day being twenty business days prior to the date and time specified in clause 4.1.28(b), provide to AEMO the information described in clause 4.28.8.

In accordance with the Market Procedure for: Individual Reserve Capacity Requirements, AEMO will provide details on the website as to the nature and format of the data that must be submitted.

Data requirements for IRCR

Market customers must provide the information to AEMO (clause 4.28.8 of the WEM Market Rules) in the following nature and format:

An email or letter from the market customer specifying the interval meters (10 digit NMI format) associated with that market customer that the market customer considers AEMO should treat as non-temperature dependent loads (clause 4.28.8(a)). Along with the list of specified interval meters, evidence of intervals operating below capacity due to maintenance or a Saturday, Sunday or a public holiday may also be provided. A sample template can be found here: NTDL-Maintenance Intervals Template.

Market customers with changes to the nominations of capacity requirements for intermittent loads should submit a WEMS facility standing data change request with the nominated maximum allowed level of intermittent load and maximum contractual maximum demand, and a letter or email from the market customer providing evidence to AEMO of this contractual maximum demand level.

Market customers with no changes to the nominations of capacity requirements for intermittent loads should submit an email or letter from the market customer stating the nominated maximum allowed level of intermittent load and maximum contractual maximum demand applicable for the relevant capacity year, or an email or letter from the market customer stating AEMO may use the values recorded in WEMS for each intermittent load for the relevant capacity year.

For each capacity year, a market customer may only provide AEMO with the information specified in this clause once with respect to each load.